Mighty Monarch of The Air

[old_coot88]

Well son of a gun. Fancy that. First of all, is your set the version with the 'color converter socket' and "color switch" (M7)? If so, clean the heck outa that switch with contact cleaner since it's in the video signal path and could be killing the video if it's dirty.**
Also if the set has a phono input and a TV-phono switch (M6), good idea to clean that switch too while you got the squirt can going.

Originally Posted by vts1134

Can some one tell me what Horizontal Drive and Horizontal AFC are/do?

Drive adjustment is supposed to vary the amplitude of the signal going to the 6AV5's control grid.
AFC= automatic frequency control. One section of the 6SN7 (V15) serves the AFC function while the other section is the oscillator.

**Just like the 'service switch' in color sets. Ask Phil about that.